It took me a while to figure out how to unlock these trading cards. After linking up your account go to the pottermore website.
step 1: go through all of the chapters at the main screen.
2: At chapter 5 you will be forced to actually do some searching (sadly). While in Diagon Alley, zoom in all the way and the click on the building to the left.
3: After you do that click on the note on the ground, you are then able to enter the bank and move on.
4: Go to next section of chapter.
5: Shopping: Pretty straightforward, enter all the stores buy what you need move on to wand shop.
6kip the next few chapters, you are now at the sorting ceremony, and can now link your trading cards.
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